// ** If we encounter an error - display a message in the appropriate element ** //
var node_text = 3; // DOM text node-type
emptyString = /^\s*$/


function displayError(eId,eMessage) {
  // setting an empty string can give problems if later set to a 
  // non-empty string, so ensure a space present. (For Mozilla and Opera one could 
  // simply use a space, but IE demands something more, like a non-breaking space.)
  var dispmessage;
  if (emptyString.test(eMessage)) 
    dispmessage = String.fromCharCode(nbsp);    
  else  
    dispmessage = eMessage;

  var elem = document.getElementById(eId);
  elem.innerText = dispmessage;
  elem.style.display = "block";

  //var parentId = eId + '_parent';
  //alert ('Parent is ' + parentId);
  //var parentElem = document.getElementById(parentId);
  //parentElem.style.display = "inline";
  
}


// ** Check that something has been entered ** //
function validRequired(formField,errEl) {
	var result = true;
	
	if ((formField.value == "") || (formField.value == null)) {
		//alert('Please enter a value for the "' + fieldLabel +'" field.');
		//formField.focus();
		displayError(errEl,'This field requires an entry');
		result = false;
	}
	
	return result;
}

// ** Check that the select box has a value other than null if required ** //
function validRequiredSelect(formField,errEl) {
	var result = true;

	if ((formField.value == '') || (formField.value == 'null')) {
		displayError(errEl,'Please select from the below options');
		result = false;
	}

	return result;
}


// ** Check that no Digits have been entered ** //
function allDigits(str) {
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset) {
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++)
		if (charset.indexOf(str.substr(i,1))<0) {
			result = false;
			break;
		}
	
	return result;
}


// ** Email Validation Functions ** //
function validEmail(formField,required,errEl) {
	var result = true;
	
	if (required && !validRequired(formField,errEl))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		//alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		//formField.focus();
		displayError(errEl,'Please enter a valid email address');
		result = false;
	}
   
  return result;
}
function isEmailAddr(email) {
  var result = false;
  var theStr = new String(email);
  var index = theStr.indexOf("@");
  if (index > 0)
  {
    var pindex = theStr.indexOf(".",index);
    if ((pindex > index+1) && (theStr.length > pindex+1))
	result = true;
  }
  return result;
}

// ** Phone Number Validation ** //
function validPhone(formField,required,errEl) {
	var result = true;

	if (required && !validRequired(formField,errEl))
		result = false;

	if (result) {
		if (!allDigits(formField.value)) {
 			displayError(errEl,'Please enter a valid phone number (no spaces)');		
			result = false;
		}
	}

	return result;
}


// ** Number Validation ** //
function validNum(formField,required,errEl)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		if (!allDigits(formField.value))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}
function validInt(formField,required,errEl)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var num = parseInt(formField.value,10);
 		if (isNaN(num))
 		{
 			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 
	
	return result;
}


// ** Date Validation ** //
function validDate(formField,required,errEl)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
  
 	if (result)
 	{
 		var elems = formField.value.split("/");
 		
 		result = (elems.length == 3); // should be three components
 		
 		if (result)
 		{
 			var month = parseInt(elems[0],10);
  			var day = parseInt(elems[1],10);
 			var year = parseInt(elems[2],10);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
					 allDigits(elems[1]) && (day > 0) && (day < 32) &&
					 allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
 		}
 		
  		if (!result)
 		{
 			alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 
	
	return result;
}